INTRODUCTION:

This is my [Dagath] build for general use and void cascade all the way to levelcap, [Dagath] is an interesting frame that has many things going on. I feel that she is severely underused and underrated.
Most annoying thing about her is the UI bug in endurance missions DE pls fix <3

The UI bug has been fixed in warframe 1999! :D

This is a build that uses shield gating whenever your 3rd ability is on cooldown. You will shield gate with 1 press of her first ability.

So some explanation behind the build.

Augmented + red shard hits 289% str for full armor strip with 4th ability and cap on doom more about this below.

Usually you would also go molt efficiency for more duration but since we are shield gating before we activate spirit form we don't really benefit from it so more energy is better in this case imo since you have more energy to shield gate with and nuke with your horses outside of spirit form.
Arcane avenger doesn't work in spirit form either so that's kind of a waste most of the time. You can use whatever you like though

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WIKI EXPLANATION:

Inflict damage to a Doomed foe with [Dagath]'s weapons and abilities to trigger Phantom Wrath, which summons a floating spectral sickle above that individual target and stores % of every damage instance dealt by [Dagath] herself within a time limit of 2 seconds. After the time limit elapses, or when the stored damage amount becomes lethal to its target, the spectral sickle strikes its victim to inflict the stored damage as True damage. Phantom Wrath can be triggered again repeatedly on Doomed foes.
Damage [Redirection] per damage instance is capped at 100%, achievable with 286% Ability Strength.
Stored damage is based on damage dealt after all sources of enemy Damage Reduction are applied.
Phantom Wrath is also applied on Doom's initial cast to store a percentage of the ability's Viral damage.
Each Doomed foe may only have one sickle floating above them at a time.
Phantom Wrath's stored damage is not shared between Doomed enemies, only to the single individual enemy.
Lethal damage is calculated including Virus status effect but not damage bonuses such as Roar, damage vulnerability debuffs such as Sentient Wrath or damage reductions, despite being affected by them.

The build is by no means perfect but if you read through it you will hopefully understand why i like it.

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Stats

DURATION:
I use tons of duration so i get almost 30s uptime on her 3rd ability which with the augment makes her invincible and applies doom (her 2nd ability) to enemies with every damage instance both abilites and weapons.

STRENGTH:
Strength scales both your horse damage and the crit damage you get from your 3rd ability which in turn scales with doom and it's true damage. 286% is the breakpoint for full armor strip with your 4th ability. I achieve that with 1 strength shard + molt augmented 229+60 = 289%

RANGE:
You for the most part don't need lots of range due to your weapons applying doom with your 3rd ability augment, however when your 3rd ability is on cooldown it is very nice to be able to still spread your doom somewhat with 1+2 (you should already have spread doom during your 3rd ability with spamming 1 continuously).
Not to mention it also spreads viral and has a 95% slow.
Only reason i have [Augur Reach] is for better doom spread outside of spirit form and so 1st ability fully shield gates with 1 press.

EFFICIENCY:
Only time you need to care about energy is when your 3rd ability is on cooldown because everything you kill while in your 3rd ability drops health orbs, so tons of health orbs + her passive gives u essentialy infinite energy as long as you can kill stuff.

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PLAYSTYLE:

The way i play my [Dagath] is i active the 3rd ability then mainly use her as a weapon frame with giga big crit multiplier, while in your 3rd ability you want to cast 1 all the time for passive spread of doom and 95% slow + viral priming. for when your 3rd ability goes on cooldown everything close thats still alive is already doomed slowed and viral primed.

You can also armor strip and nuke everything in a line in front of you with her 4th ability, 1+4 while in spirit form or 1+2+4 while not in spirit form.

So essentially you have viral spreading doom spreading and shield gating on 1 ability which is kinda crazy, then you also have in line nuke with your 4th + armor strip. not to mention immortality + tons of crit damage and true damage.

What i usually do when my 3rd ability runs out depends on how it looks, if there are a lot of doomed enemies around cus i spammed scythes during my spectal form i can simply press 4 to almost instantly get back into spectral form, or i spread some doom with 1+2 while im killing stuff with my guns.

ARCHON SHARDS:

2 casting speed shards is borderline mandatory for [Dagath] especially if you want to use her 4th ability a lot, 3rd ability is also very slow. I then use 3 red shards 1 for strength and 2 for duration.

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HELMINTH:

I have tried many different helminths on [Dagath] but they way i enjoy her the most is without any helminth abilities. You can either subsume 1 or 4 mainly but if you subsume 1 you have no way of spreading doom in a good way outside of your 3rd ability which really hurts your damage if doing difficult content.

You can subsume the 4th ability but then you lose full armor strip iframes nuking + viral application source which might be worth it depending on what you are doing.

The ones worth using in my opinion are mostly for endurance runs which are Nourish, Xatas whisper, eclipse or roar depending mainly on what weapon you want to use and then play her as a weapon frame. you subsume her 4th ability usually..

You can subsume wrathful advance for tons of damage with red crits on melee but please don't fall for the bug it doesn't do damage cap it's just a visual bug as demonstrated in this video https://youtu.be/cloGG5oK5MY?si=5gQ_BJtsr7FQzrlw (Not my video all credit to Semaradrid)

Tons of options really but i prefer "vanilla" [Dagath] so i won't go into it too much here but roar is decent for full on nuke build with your 4.

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WEAPONS: You need a pretty good weapon for [Dagath] to be really good, bad weapon = mediocre [Dagath]

I recommend anything with good crit to take advantage of doom and spirit crit scaling
This is where it kinda gets a bit weird sometimes, dagaths true damage from doom can steal kills from your weapons so some arcanes and galv mods can suffer a bit from that before they get going and stack up their damage a bit, but usually if your weapon is strong enough you don't have big issues of maintaining all those buffs in my experience.

Some weapons i have used and liked are

[Miter]
[Strun]
[Torid]
[Burston]
Toxocyst
[Latron]

Good loadout for endurance runs is [Miter] [Furis] and [Falcor].